“In this context, and my worldview, sex = gender”

But that’s the whole thing about it…your worldview doesn’t matter. Sex != Gender. You lot are just not intelligent enough to understand the difference and that makes you inherently defensive when it comes to the subject, which is why you react as any animal that perceives itself being attacked and lash out. But no one is attacking YOU by expressing themselves with full nuance. You just don’t have the faculties to understand the difference so you paint with a wide brush.

Sex is often the preferred term when referring to biology (for instance, “in many species, members of the male sex are larger than those of the female sex”), while gender is the preferred word when referring to behavioral, cultural, and psychological traits, admittedly typically associated with sex in most cultures (for instance, “young people more likely to challenge the gender norms they grew up with.”)